Post Number: 4
|Posted on Thursday, 08 September, 2016 - 05:02 pm: |
Can anyone tell me the thread size and type for Silver Cloud 57 six cylinder exhaust manifold studs? I need to fix a thread and would like to purchase the correct tap.
Also does anyone in Australia sell these studs?
Posted From: 18.104.22.168
|Posted on Friday, 09 September, 2016 - 02:27 am: |
It is 5/16" UNF, the SAE threads. The studs are high grade steel typically EN24 or 1%Cr 1%Ni, and quite difficult to drill out.
Introcar have them.
(Message approved by david_gore)
Post Number: 2197
|Posted on Friday, 09 September, 2016 - 08:29 am: |
Do not be tempted to use "high tensile" threaded rod from hardware stores to fabricate the studs as an alternative. These often come from low-cost manufacturers often in Asia and the quality control in their manufacture either leaves a lot to be desired or is non-existent. The OEM studs would be an alloy steel such as En24 [SAE 4340] or similar heat treated to SAE Grade 8 or equivalent specification.
I would recommend purchasing the studs from a recognised R-R/B parts supplier such as Introcar as suggested by Christopher.
Post Number: 5
|Posted on Monday, 12 September, 2016 - 08:10 pm: |
Thank you for the advice. For some reason I thought they may have been BSF sizes.
I had one snap inside the block, but have been successful in drilling it out. A 6mm Cobolt did the trick. The remnants I tapped out with a centre punch.. Got a new quality 5/16 UNF tap. All clean now.
I will purchase the real studs. Don't want to cut any corners. Thanks for the Introcar recommendation.
richard george yeaman
Post Number: 613
|Posted on Monday, 12 September, 2016 - 09:55 pm: |
Hi Benjamin there is nothing like a happy ending.